Count of Flanders

The Count of Flanders was the ruler or sub-ruler of the county of Flanders from the 9th century until the abolition of the position by the French revolutionaries in 1790.

Although the early rulers, from Arnulf I onwards, were sometime referred to as margraves or marquesses, this alternate title largely fell out of use by the 12th century. Since then the rulers of Flanders have only been referred to as counts.

The Counts of Flanders enlarged their estate through a series of diplomatic manoeuvres. The counties of Hainaut, Namur, Béthune, Nevers, Auxerre, Rethel, Burgundy, and Artois were acquired via marriage with the respective heiresses. The County of Flanders itself suffered the same fate. By the marriage of Countess Margaret III with Philip II, Duke of Burgundy, the county and the subsidiary counties entered a personal union with the Duchy of Burgundy in 1405. The county itself ceased to exist in 1795.